add dali image iterator for arcface #1339
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nvidia-dali 从入门到放弃
安装
官方文档：https://docs.nvidia.com/deeplearning/dali/user-guide/docs/installation.html
我用的是 cuda101，按照 CUDA 10 的方式安装：
参考例程
转换训练数据
因为原始的数据头尾都带有一些信息，无法用作训练，暂时还不知道咋用 dali 把头尾数据解析出来，就直接暴力去掉了。
修改文件
dali_convert_rec.py(见附件)内参数:path_imgrecpath_recpath_idx, 然后运行:测试
修改文件
recognition/ArcFace/dali_image_iter.py内参数path_imgrec路径后, 运行该文件:只增加了随机镜像的增强方式，SSD 速度约 18000 samples/s，HHD 速度约 8000 samples/s。
附件
dali_convert_rec.py.zip